roof·tree /ˈrufˌtri, ˈrʊf-/
  棟梁,屋頂
  Roof·tree n. The beam in the angle of a roof; hence, the roof itself.
     Now for me the woods may wither, now for me the rooftree fall.   --Tennyson.
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  rooftree
       n : a beam laid along the ridge of a roof; provides attachment
           for upper end of rafters [syn: ridge, ridgepole]